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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Part 3 (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 165 Months Ended |
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Unamortized investment tax credits [Member] | Sep. 30, 2012 Unamortized investment tax credits [Member] | Sep. 30, 2013 Accrued cost of removal [Member] | Sep. 30, 2012 Accrued cost of removal [Member] | Sep. 30, 2013 Other Regulatory Liabilities [Member] | Sep. 30, 2012 Other Regulatory Liabilities [Member] | Sep. 30, 2013 Future income taxes due from customers [Member] | Sep. 30, 2012 Future income taxes due from customers [Member] | Sep. 30, 2013 Pension and postretirement benefit costs [Member] | Sep. 30, 2012 Pension and postretirement benefit costs [Member] | Sep. 30, 2013 Unamortized purchased gas adjustments [Member] | Sep. 30, 2012 Unamortized purchased gas adjustments [Member] | Sep. 30, 2013 Purchased gas costs [Member] | Sep. 30, 2012 Purchased gas costs [Member] | Sep. 30, 2013 Compensated absences [Member] | Sep. 30, 2012 Compensated absences [Member] | Sep. 30, 2013 Other [Member] | Sep. 30, 2012 Other [Member] | Sep. 30, 2013 Deferred Costs Incurred Prior to YE 1999 [Member] | Sep. 30, 2013 Deferred Costs Incurred Prior to YE 1999 [Member] | Sep. 01, 2013 Missouri Gas Energy (MGE) [Member] | Sep. 01, 2013 Laclede Group [Member] Missouri Gas Energy (MGE) [Member]
Schedule of Regulatory Assets and Liabilities[Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets | $ 563,480,000 | $ 496,721,000 |  |  |  |  |  |  | $ 112,912,000 | $ 118,997,000 | $ 381,395,000 | $ 304,446,000 | $ 17,533,000 | $ 40,674,000 | $ 18,249,000 | $ 18,386,000 | $ 8,004,000 | $ 7,836,000 | $ 25,387,000 | $ 6,382,000 |  |  |  |
Regulatory Liabilities | 85,460,000 | 59,432,000 | 2,900,000 | 3,113,000 | 59,066,000 | 55,103,000 | 23,494,000 | 1,216,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulated Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets not earning a rate of return | 17,200,000 | 7,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets not earning a rate of return, recovery period | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Assets - Non-current | 545,947,000 | 456,047,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,500,000 | 10,500,000 |  |
Amortization period of deferred costs (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Amortization of deferred costs recognized to date - total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,700,000 |  |
The amount by which the replacement cost exceeds (less than) the cost basis value of stored gas inventories | 13,300,000 | 24,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired during period | 247,078,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 247,078,000 | 247,100,000
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Unbilled Revenue | $ 25,200,000 | $ 11,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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